Mat



FIG. 1 is a front perspective view of a mat showing my design;

FIG. 2 is an exploded view thereof showing a covering and insert of the mat;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a rear elevation view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a left side view thereof;

FIG. 7 is a top plan view thereof;

FIG. 8 is a bottom plan view thereof; and,

FIG. 9 is a rear perspective view thereof.

The broken lines shown in the figures depict features of the mat that form no part of the claimed design. 

CLAIM The ornamental design for a mat, as shown and described. 